Chalk line marker

Details Chalk line marker Chalk line marker

1990-10-17

1993-04-13

Douglas, Alan P.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

D10 72

Patent

active

D03347176

REFERENCES:
patent: D314156 (1991-01-01), Doyle
patent: D315109 (1991-03-01), Ingram, II et al.
patent: D319347 (1991-08-01), Van Landingham, Jr. et al.
patent: 3568483 (1971-03-01), Woofter
patent: 4527334 (1985-07-01), Jones et al.
patent: 4927092 (1990-05-01), Ingram, II et al.

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